I've realized that there's more stigma against masturbators than there is against vibrators. If someone came across my vibrator, I'd be embarrassed but not enough to keep me from buying them. Do what you want and forget about everyone else!

You're of age so if you want to buy one, buy one and don't be ashamed of it. Owning a male sex toy just means you're a guy who wants to experience something different from time to time. There's nothing wrong with that.

If still feel that you need to hide it, along with what's already been mentioned for hiding spots you could also drop it in a Ziploc bag and store it in a deep pocket of an old jacket or something that rarely gets pulled out of your closet.